[CH2:1]([C:3](=[CH:8][CH3:9])[CH:4]=[CH:5][CH2:6][NH2:7])[CH3:2].[C:10]([N:12]=[C:13]([C:18]1[CH:19]=[N:20][CH:21]=[CH:22][CH:23]=1)OC(C)C)#[N:11].C[O-].[Na+]>CO.O>[C:10]([NH:12][C:13]([C:18]1[CH:19]=[N:20][CH:21]=[CH:22][CH:23]=1)=[N:7][CH2:6][CH:5]=[CH:4][C:3]([CH2:1][CH3:2])=[CH:8][CH3:9])#[N:11]
To a solution of crude 4-ethyl-2,4-hexadien-1-ylamine (1.38 g) and isopropyl N-cyano-3-pyridinecarboximidate (1.74 g) in methanol (35 ml) at room temperature was added 28% sodium methoxide in methanol (2.13 g). After 10 minutes, the mixture was diluted with water and extracted three times with dichloromethane. The organic layer was washed with brine, dried over anhydrous sodium sulfate, and evaporated in vacuo. The residue was chromatographed on silica gel (5% methanol in dichloromethane) to give N-cyano-N'-(4-ethyl-2,4-hexadien-1-yl)-3-pyridinecarboximidamide (1.89 g) as an oil.
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